It is not conceivable that there will be a car with a billboard in any race, ever.
See the image above of the Tesla with the clock on top, now go to google images and look up images of marathob lead vehicles - that Tesla wasn’t any closer or any more if a billboard than the lead vehicles in all world major marathons. Heck, some world majors have a lead vehicle with stadium seating so select spectators get a front row view… but that meets the purists’ standards of acceptance… sounds like people need to watch the race and watch other world major marathon races before providing an ill founded opinion.